package core;

/**
 * A <code>ZoneObserver</code> subscribes to a single <code>Zone</code> subject to
 * receive updates whenever a <code>Card</code> is added to or removed from the
 * <code>Zone</code>.
 */
public interface ZoneObserver
{
	public void cardAdded(Card card);
	public void cardRemoved(Card card);
}